macros, being the fundamental programming paradigm used in tex, the macros tag is likely more important here and the possibility of confusion greater. Are there many occasions that you move from one site to the other and get confused by the tag names being different?
– David CarlisleJun 10 at 16:12

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@DavidCarlisle Actually, yes. I am more frequently on other Stack Exchange sites and joined this one when I started dabbling in LaTeX. It was confusing to me that this site used a different tag for macOS than all the others.
– ThunderforgeJun 10 at 19:44

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@Skillmon the tag macos is already used so the "confusion" is already here.
– Paul GaboritJun 11 at 23:44

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How about mac-os? I'm definitely in favour of merging all macOS related tags into one.
– Henri MenkeJun 12 at 3:08

@HenriMenke That still has the problem of not matching other sites. Besides, if we kept macos as a synonym that redirects to mac-os, then we'd still have confusion anyway.
– ThunderforgeJun 12 at 14:52

@PaulGaborit - There are only 44 macos-tagged postings on TeX.SE, 482 mactex-tagged postings, and a whopping 5752 macros-tagged queries. Changing the tag of the mac postings to macos would increase the number of macos-tagged queries by a factor of more than 10 -- and thus quite likely cause actual confusion.
– MicoJun 13 at 6:07

The majority of the 44 macos-tagged postings is not actually related to MacOS (the operating system) in a meaningful way. If anything, many of these postings should be re-tagged as either mac or mactex. However, there is a handful of macos-tagged postings with a clear link to MacOS, so I wouldn't get rid of the macos tag entirely -- or make it into a synonym for mac.

I can see no justification for re-tagging all 559 mac-tagged postings as macos. The focus of the overwhelming majority of the mac-tagged postings is clearly the Mac ecosystem, not the MacOS operating system (a small subset of the Mac ecosystem). One can easily verify that some of the mac-tagged postings are not acually all clearly related to any part of the Mac ecosystem and hence that the mac tag isn't appropriate for them. However, the fact that the postings are tagged incorrectly cannot be a reason for adopting the macos tag for them.

I would certainly not advocate changing the tag of mactex postings to macos.

There are also some postings tagged with texworks, a multi-platform front-end, and some of these postings are from users who use texworks on a Mac. However, the focus of these postings is on texworks, and it would be an error to change their tags to mac, let alone macos.

Another thought: Currently, postings tagged with macros outnumber those tagged with macos by a factor of more than one hundred to one. Since we should care about not creating unnecessary confusion, and because macos and macros do look rather alike at first glance, increasing the number of macos-tagged postings by a factor of more than 10 could very well be rather counterproductive.